{"id":"abd590ef-e2f6-4344-8f93-cf2885fba01d","shortId":"ru2Wdk","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/claims/80` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Each call is gated by an x402 payment challenge settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an `X-PAYMENT` header with a valid payment proof.\n\nThe specific `/api/v1/claims/80` endpoint is labeled \"Premium API Access\" in the x402 challenge but lacks further documentation about what data or functionality it returns. The broader site lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, the `/api/v1/claims/80` path does not appear in any of those documented categories, so its exact purpose is unclear.\n\nThe endpoint is confirmed live: it returns a well-formed HTTP 402 challenge with x402 version 1, accepting the `exact` payment scheme on Base with USDC (contract `0x8335…2913`). The payment timeout is 300 seconds. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so details about request/response schemas, supported parameters, and output format are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","402 payment required API"],"warnings":["The /api/v1/claims/80 path is not listed among the documented endpoints on the landing page — its purpose is unclear.","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no usable content.","No request or response schema is available; callers cannot know what to send or expect back.","The 'Premium API Access' label is generic and does not describe actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/80","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/claims/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation for this specific path (/api/v1/claims/80), no request/response schema, no examples, and the docs pages are all blank. The endpoint's actual functionality is 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'0.02':10,24,79,169 '000':83 '0x8335':219 '1':208 '20':82 '2913':220 '300':225 '402':203 '402 payment required API' '6':87 'Base network API' 'USDC micropayment endpoint' 'accept':209 'access':119 'ai/ml':55 'analysi':147 'analyt':54 'api':5,19,51,90,118 'appear':178 'attach':100 'base':8,22,76,84,215 'beyond':228 'broader':136 'call':63 'caller':98 'categori':184 'challeng':70,123,204 'classif':150 'collect':42 'confirm':194 'connect':241 'contract':218 'convers':162 'data':53,58,130,143 'decim':88 'detail':244 'document':127,183,227 'embed':151 'empti':234 'endpoint':6,20,30,114,139,192 'essenti':233 'estim':159 'exact':187,211 'exchang':154 'export':144 'feed':153 'finance/web3':57 'form':201 'format':252 'function':132 'gas':158 'gate':3,17,65 'generat':164 'geocod':160 'header':105 'howev':172 'http':202 'http-post' 'infer':56 'infrastructur':60 'insight':145 'json-response' 'key':91 'label':116 'lack':125 'land':230 'limit':93 'list':138 'live':195 'lowpaymentfee' 'lowpaymentfee.com':37 'metric':141 'network':77 'offer':40 'output':251 'page':231,238 'paramet':249 'part':34 'path':175 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payment':69,104,109,212,222 'per':11,25,49,80 'platform':38 'point':171 'premium':4,18,117 'premium API access' 'price':152,170 'proof':110 'protocol':46 'purpos':188 'quot':157 'rate':92,155 'report':142 'request':12,26,50,81 'request/response':246 'requir':97 'return':134,197 'schema':247 'scheme':213 'second':226 'sentiment':146 'settl':71 'show':240 'simpli':99 'site':137 'span':52 'specif':112 'sub':237 'sub-pag':236 'subscript':95 'summar':149 'support':248 'text':148 'timeout':223 'token':156 'unavail':254 'unclear':190 'unit':85 'usdc':14,28,73,217 'usdc-base' 'util':61 'valid':108,161 'version':207 'wallet':242 'well':200 'well-form':199 'x':103 'x-payment':102 'x402':2,16,45,68,122,206 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"6926668d-17af-48ec-b0cf-bcc415cb3448","listingId":"abd590ef-e2f6-4344-8f93-cf2885fba01d","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/claims/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:58.562Z"}],"sources":[{"listingId":"abd590ef-e2f6-4344-8f93-cf2885fba01d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:58.562Z","lastSeenAt":"2026-04-23T20:02:20.705Z"}],"details":{"listingId":"abd590ef-e2f6-4344-8f93-cf2885fba01d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402 version 1, exact scheme, on Base network, with USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/80"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/claims/80"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Listed API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access on Base","Demonstrating x402 protocol payment flows in development or testing"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume batch processing where per-call fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.961Z"},"updatedAt":"2026-04-23T20:02:20.705Z"}}